Two-chamber refrigerators Atlant are deservedly considered one of the most reliable units on the market post-Soviet space. However, even the best quality equipment breaks down over time, and one of the most common causes of breakdown is a malfunction of the compressor start-up relay. If your refrigerator stops freezing, makes clicking noises or buzzes, but does not start, most likely the problem lies in this unit. Replacing a relay is a procedure that is accessible even to a beginner, if you strictly follow the algorithm of actions and observe safety precautions.
In this article we will analyze in detail the process of diagnosing and replacing the relay on models Atlant, including the popular 1700, 1800 and 4000 series. We will look at how to distinguish a burnt part from the worker, what tool you will need and what to look for when choosing a new component. A correctly performed replacement will extend the life of your compressor and restore the temperature in the chambers without calling a technician.
Symptoms of a faulty start-up protection relay
Before you start disassembling, you need to make sure that the problem is really in the relay. Start-up protection relay responsible for starting the compressor engine and protecting it from overheating. When this component fails, the refrigerator behaves predictably, but these symptoms can be confused with a breakdown of the motor itself. Most often, owners notice that the unit turns on, there is a loud click, the hum lasts a few seconds, and then another click follows and turns off.
Sometimes the situation looks different: the compressor hums, but does not start, while the motor housing can become very hot. In rare cases, the relay simply opens the circuit and the refrigerator remains silent, although the indicators on the control panel are on. It is important not to confuse these signs with a freon leak or a clogged capillary, where the motor can run without stopping, but does not cool down.
For an accurate diagnosis, you should listen to the nature of the sound. A healthy startup occurs quickly and with a characteristic increase in hum. If you hear a series of frequent clicks with an interval of 30-60 seconds, this is a sure sign that the starting winding is not working correctly. Also, a malfunction may be indicated by a burning smell in the compressor area, which indicates overheating of the contacts. thermal relay or the starting winding does not operate correctly. Also, a malfunction may be indicated by a burning smell in the compressor area, which indicates overheating of the contacts.
- 🔊 The refrigerator clicks, buzzes for 5-10 seconds and turns off.
- 🔥 The compressor is hot to the touch, but not starts.
- 🔌 Lack of response to turning on the network when the backlight is working.
- ⚡ Broken plugs or tripped circuit breaker in the panel when trying to start.
⚠️ Attention: If after a series of clicks you feel a persistent smell of burnt wiring or see sparking, immediately unplug the refrigerator from the network. Further attempts to turn on may lead to complete combustion of the compressor windings.
Tools and preparation for repairs
To successfully replace the relay on a two-chamber refrigerator Atlant no complex professional equipment is required. Most men have a basic set of tools in their garage. The main thing is to provide free access to the rear wall of the unit. You will need to move the refrigerator away from the wall at least 50-70 cm so that you can work freely around the compressor.
Before starting any work be sure to disconnect the refrigerator from the power supply. This is a critical safety rule and, if ignored, may result in electric shock as you will be working with 220 volt live parts. Let the unit stand turned off for at least 10-15 minutes so that the pressure in the refrigerant system has time to equalize.
You will need the following tools and materials: flat-head and Phillips screwdrivers, pliers, a multimeter (for checking the circuit) and, possibly, a knife for stripping contacts. Also have a container ready for small parts so you don't lose any screws or mounting brackets. If you have a smartphone, take a photo of connecting the wires before disconnecting them - this will help you avoid mixing up the colors during assembly.
☑️ Preparing to replace the relay
Removing the old relay: step-by-step instructions
The process of removing the relay on refrigerators Atlant is standardized, but requires care. The compressor is usually located in a niche at the bottom of the rear wall. In some models, access to it is closed with a metal or plastic casing, which is secured with screws or latches. Unscrew the fastenings and remove the cover to get a full view of the motor.
At the end of the compressor you will see a small box put on three pins - this is the start-protection device. Models Atlant often use brand relays RTK, RTP or more modern ones LS-08B. Before removing the part, carefully inspect the terminal block. Markings may be applied on it C, S, R, indicating the common, starting and working windings, respectively.
Carefully disconnect the wires from the relay contacts. They can be held in place with a tight fit or secured with clamps. Do not pull the wires too harshly to avoid breaking them at the base. Remove the retaining bracket (U-shaped plate) that holds the relay to the compressor housing. After this, the device can be easily removed from the pins.
Contact connection diagram (standard for Atlant):C (Common) - Common wire (often black or white)
S (Start) - Start winding
R (Run) - Working winding
If the old relay has traces of melting, soot or cracks on the body, its replacement is necessary in any case. Even if it is visually intact, the internal mechanical part could have worn out. Thermal protection Inside the relay could simply “get tired” and stop keeping contact, which causes periodic shutdowns.
Is it possible to restore the old relay?
Theoretically, an RTK type relay can be disassembled, the contacts can be cleaned and the movable core can be turned over. However, the resource of such repairs is extremely short - from several days to weeks. Considering the low cost of a new part, restoring an old relay is not economically feasible and is a fire hazard.
Selection of an analogue and compatibility of models
One of the main difficulties during repair is finding a suitable spare part. Relays for refrigerators Atlant are not universal for all models, although many of them are interchangeable. The key selection parameters are the compressor power and the type of refrigerant (R12, R134a, R600a). There is always a marking on the body of the old relay, for example, RTK-1, RTK-2 or LS-04B.
Modern models are often equipped with universal starting devices that are suitable for a range of capacities. For example, a relay LS-08B often replaces several older modifications. When purchasing, pay attention to the orientation of the pins - they must match the seat on your compressor.
| Marking of the old relay | Compressor type | Possible analogue | Features |
|---|---|---|---|
| RTK-1 / RTK-1.3 | Single-phase, R12 | LS-04B / 4509 | Requires an adapter block |
| RTK-2 / RTK-2.3 | Single-phase, R12 | LS-08B / 4510 | Direct replacement possible |
| RTP-0 | Single-phase, R134a | PTC-22 / 4506 | Posistor start type |
| 17.50.15.100 | Inverter (rarely) | Original Atlant | Only original spare parts |
If you are not sure of the choice, it is better to take the old relay with you to the store or photograph its markings and consult with the seller. Setting a relay cut-off that is inappropriate for current can result in the compressor either constantly knocking out the protection or burning out from overload.
Installing a new relay and checking operation
Installation of the new part is carried out in the reverse order of dismantling. Carefully inspect the pins on the compressor - they should be clean and not oxidized. If they have deposits, carefully sand them with fine sandpaper. Slide the new relay onto the contacts as far as it will go. It should fit tightly and not dangle.
Connect the wires to the appropriate terminals, checking the photo taken during the disassembly stage or the color marking. Usually the black wire goes to the common contact, and the rest are distributed according to the diagram. Make sure that the wires do not touch the hot parts of the compressor and are at a safe distance.
Secure the relay with the retaining bracket and install the protective cover in place. Only after complete assembly can you plug in the refrigerator. The first start may take a few seconds - don't be alarmed if the engine doesn't start immediately. Listen: the hum should be smooth, without knocking or vibration.
⚠️ Attention: It is strictly forbidden to turn on the compressor without installed thermal protection or with a loose relay. This can lead to a short circuit or mechanical damage to the contacts due to vibration.
Check the operation of the refrigerator for 15-20 minutes. During this time, the compressor must reach the temperature and turn off when it reaches the set mode. If the cycle is successful (start-up - operation - normal shutdown), the repair can be considered complete.
Frequent errors and troubleshooting
Even with correct installation, problems may arise nuances. If the refrigerator started working, but after a while it stopped freezing again, perhaps the problem was not only in the relay. Often, along with the relay, it also fails starting capacitor (if it is in your model), which should also be replaced.
Another common mistake is poor contact in the terminal block. If the wires are not inserted completely or are oxidized, heating will occur at the contact point, which will again trigger the protection. Always check the tightness of the wires.
It also happens that the new relay is working properly, but the compressor still does not start or the machine breaks down. This may indicate an interturn short circuit in the motor windings. In this case, replacing the relay will not help, and more serious repairs or replacement of the entire compressor will be required.
- 🔍 Check the tightness of all wires before turning on.
- 🌡️ Make sure that the refrigerator is level and operating in a ventilated place.
- ⏱️ Give the compressor cool down for 30-40 minutes before repeating tests.
What to do if, after replacing the relay, the refrigerator hums but does not start?
If you installed a new relay, but the situation has not changed (hums, clicks and turns off), two options are possible. The first is that the new relay is also defective or does not match the current parameters. The second, and more probable, is that the compressor itself is “jammed” or the lubricant has dried out. In some cases, gently “swinging” the motor (short-term supply of voltage directly) helps, but this is a risky procedure that requires skill. Also, the cause may be a malfunction of the thermostat, which does not give a signal to start.
Is it possible to use a relay from another brand, for example, Indesit or LG?
You can use relays from other brands, but only if the electrical characteristics and design of the seat completely match. Relays from Indesit often have a different housing shape and contact arrangement, which will require reworking the mounting, which is undesirable. It is better to look for universal analogues marked LS or PTC, which are specially designed to replace original parts from various manufacturers.
How often do you need to change the prevention relay?
The start-up protection relay is not a consumable item that is changed on a schedule. Its resource is designed for the entire service life of the compressor (10-15 years). No preventive replacement is required. You need to change the part only if obvious signs of a malfunction appear: problems with starting, clicking or overheating.
Is it dangerous to change the relay yourself if the refrigerator is under warranty?
If the warranty period is still valid, any independent intervention, including replacing the relay, will lead to the removal of the unit from the warranty. Breaking of seals and violation of wiring integrity is recorded by service centers. In case of warranty, it is strongly recommended to contact only authorized service centers of the manufacturer.
Why does the relay heat up during operation?
Slight heating of the relay body to 50-60 degrees is a normal operating process, since current passes through it. However, if the relay becomes so hot that it is impossible to touch it, or it smells like burning plastic, this is a sign of overload, poor contact, or an incorrectly selected model. In this case, operation should be stopped.